參數(shù)資料
型號(hào)： ZL10038LDG
廠商： Zarlink Semiconductor Inc.
英文描述： MULTIMETER, DIGITAL; Accuracy, AC voltage range:+/-1.5% rdg + 3 digits; Accuracy, DC current range:+/-2.5% rdg + 3 digits; Accuracy, DC voltage range:+/-1.2% rdg + 3 digits; Accuracy, resistance range:+/-1.5%rdg + 3 digits; Current RoHS Compliant: NA
中文描述： 數(shù)字衛(wèi)星調(diào)諧器射頻旁路
文件頁(yè)數(shù)： 30/38頁(yè)
文件大小： 939K
代理商： ZL10038LDG
ZL10036
Data Sheet
30
Zarlink Semiconductor Inc.
the underside of the board, thereby reducing the system cost. To transfer the heat from the paddle to the underside
of the board, an array of 25 x 0·3 mm vias are used between the topside pad, which will be soldered to the paddle,
and the ground plane on the underside of the board. It is also possible to use a smaller number of larger vias, e.g.
16 x 0·5 mm, but this arrangement is marginally less efficient.
The area of copper in the ground plane must be at least 2,000 mm2 for 1 oz copper. If 2 oz copper board is used or
if multiple ground planes are available, as with a four-layer board, the area could be reduced somewhat, but in
general it is better to have the maximum cooling possible, as reliability will always be enhanced if lower
temperatures are maintained.
While it is possible to use a paste mask that simply duplicates the aperture for the 4.15 mm sq. paddle, the quantity
of solder paste under the device can cause problems and it is preferable to reduce the coverage to a level between
50% and 80% of the area. The pattern shown in Figure 14 on page 30 reduces the coverage to approximately 60%,
which should reduce out-gassing from under the device and improve the stand-off height of the package from the
board.
MicroLeadFrame (MLF) Packages” which can be found on: www.amkor.com
5.2 Crystal Oscillator Notes
The 10.111 MHz frequency recommended for the crystal, is chosen such that when used with the Zarlink ZL10312
demodulator, the system frequency is 91 MHz = 9 * 10.111 MHz (91 MHz > 2 * 45 Ms/s).
Figure 14 - Typical Oscillator Arrangement with Optional Output
Figure 15 - Typical Arrangement for External Oscillator
Component
4 MHz
10.111 MHz
C10
47 pF
100 pF
C11
47 pF
100 pF
C12
*
10 pF
15 pF
*
C12 may be replaced by a link to GND if crystal output is not required.
Table 14 - Crystal Capacitor Values for 4 MHz and 10.111 MHz Operation
(component numbering refers to the example schematic, Figure 2 on page 2)
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